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Noise control for aggregate plants.

Barrier materials, operator enclosures, and resilient materials were used in a demonstration program for retrofitting aggregate plants for noise reduction. The techniques employed in the program can provide guidelines for designing, installing, and evaluating retrofit noise control systems in crushing and screening plants. This article discusses the details of a survey of the nonmetallic mining industry, the design and installation of retrofit noise control treatments, and the field evaluation of those controls under actual operating conditions.